// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// Copyright (c) 2011, Dr. Masroor Ehsan
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the author nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// $Author:$
// $Id:$
// $Rev:$
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

using System;
using NodaTime;

namespace nodatest
{
    public class TimeZoneHandler
    {
        private readonly DateTimeZone _timezone;

        public TimeZoneHandler(DateTimeZone timezone)
        {
            _timezone = timezone;
            Id = timezone.Id;
            StandardName = DateTimeUtils.PrettyTimeZoneName(_timezone.Id);
            RegionClass = DateTimeUtils.RegionFromTimeZoneId(_timezone.Id);

            var offset = _timezone.GetOffsetFromUtc(Instant.FromDateTimeUtc(DateTime.UtcNow));
            OffsetString = offset.ToString();
            IsUtc = (offset.TotalTicks == 0);
        }

        public string Id { get; private set; }
        public string StandardName { get; private set; }
        public string RegionClass { get; private set; }
        public string OffsetString { get; private set; }
        public bool IsUtc { get; private set; }

        public override string ToString()
        {
            return string.Format(@"{0} ^ {1} ^ {2}", RegionClass, StandardName, OffsetString);
        }

        public static DateTime LocalNow()
        {
            return DateTime.SpecifyKind(DateTime.Now, DateTimeKind.Local);
        }

        public static DateTime LocalDate()
        {
            return DateTime.SpecifyKind(DateTime.Now, DateTimeKind.Local);
        }

        public static DateTime UtcNow()
        {
            return DateTime.UtcNow;
        }

        public static DateTime UtcDate()
        {
            return new DateTime(DateTime.UtcNow.Year, DateTime.UtcNow.Month, DateTime.UtcNow.Day, 0, 0, 0,
                                DateTimeKind.Utc);
        }

        public DateTime UtcToLocalTime(DateTime utcTime)
        {
            var ld = Instant.FromDateTimeUtc(utcTime);
            return DateTime.UtcNow;
            //TimeZoneInfo.Local.GetUtcOffset();
        }
    }
}